積雪寒冷地域の森林流域での融雪期における物質収支  [in Japanese] Elemental Budgets of Forest Watershed at Cold Snowy Region  [in Japanese]

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Author(s)

    • 柴田 英昭 SHIBATA Hideaki
    • 北海道大学北方生物圏フィールド科学センター Field Science Center for Northern Biosphere, Hokkaido University
    • 市川 一 ICHIKAWA Kazu
    • 北海道大学北方生物圏フィールド科学センター Field Science Center for Northern Biosphere, Hokkaido University
    • 佐藤 冬樹 SATO Fuyuki
    • 北海道大学北方生物圏フィールド科学センター Field Science Center for Northern Biosphere, Hokkaido University
    • 笹賀 一郎 SASA Kaichiro
    • 北海道大学北方生物圏フィールド科学センター Field Science Center for Northern Biosphere, Hokkaido University

Abstract

<p>Elemental budgets of forest watershed during snow melting periods from end of March to end of June were determined in a cold snowy region in northern Hokkaido.</p><p>The total stream water discharge was 712 mm with a discharge ratio (discharge/precipitation) of 0.78. During the early stage of snow melting Na<sup>+</sup>, Cl<sup>-</sup>, Ca<sup>2+</sup>, Mg<sup>2+</sup> and SO<sub>4</sub><sup>2-</sup> concentrations in stream water increase remarkably, most likely due to the elements accumulated within the snowpack and surface soil, and decrease with the decrease of stream discharge. On the contrary, bicarbonate concentration decreases, at the beginning of snow melting, due to the dilution effect of the melting water, and gradually increases with the decrease of stream discharge. A Cl/Na ratio, similar to that of seawater suggests a marine origin of Na and Cl. The results from the analysis of element budgets, during the whole snow-melting season, show that: i) inputs of Na<sup>+</sup> and Cl<sup>-</sup> are similar and mostly released from the watershed; ii) inputs of Ca<sup>2+</sup>, Mg<sup>2+</sup> and HCO<sub>3</sub><sup>-</sup> are dramatically smaller than their outputs, indicating that these ions are discharged from the watershed and that the dissociation of the bicarbonate is the major proton source during the melting period. The reaction of mineral weathering and/or ionic exchange of Ca<sup>2+</sup> and Mg<sup>2+</sup> are major proton sinks with a net leaching of 16 mol<sub>c</sub> ha<sup>-1</sup> d<sup>-1</sup>, as acidification rate of the forest watershed. These findings clearly indicate that the elemental dynamic of forest watershed in cold snowy regions is quite different between the early and late stage of the snow melting process. Moreover, the net fluxes of elemental outputs are closely related to the bicarbonate dynamics within the forest watershed.</p>

Journal

  • Journal of Japanese Association of Hydrological Sciences

    Journal of Japanese Association of Hydrological Sciences 32(2), 49-56, 2002-05-31

    THE JAPANESE ASSOCIATION OF HYDOROLOGICAL SCIENCES

References:  17

Cited by:  5

Codes

  • NII Article ID (NAID)
    10008729241
  • NII NACSIS-CAT ID (NCID)
    AA11123427
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    13429612
  • NDL Article ID
    6187400
  • NDL Source Classification
    ZM44(科学技術--地球科学--海洋・陸水・火山)
  • NDL Call No.
    Z15-251
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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